interface dom.CSSGroupingRule implements CSSRuleimport { type dom } from "https://deno.land/x/evt@v2.3.1/lib/index.ts"; const { CSSGroupingRule } = dom; Any CSS at-rule that contains other rules nested within it. PropertiesreadonlycssRules: CSSRuleListMethodsdeleteRule(index: number): voidinsertRule(rule: string, index: number): number